Triethylamine → N-(1-azabicyclo[3.3.1]non-5-ylmethyl)-1H-indole-3-carboxamide

Participants

Reaction Conditions

Reaction Steps

A cooled (0° C.) suspension/solution of indole-3-carboxylic acid (0.92 g, 5.7 mmol) in anhydrous tetrahydrofuran (10 mL) was treated dropwise with thionyl chloride (0.72 g, 6.0 mmol), and the solution was refluxed for one hour and concentrated in vacuo. A cooled (0° C.) solution of 1-azabicyclo[3.3.1]nonane-5-methanamine (0.96 g, 6.2 mmol) and triethylamine (1.22 g, 12 mmol) in anhydrous tetrahydrofuran (5 mL) was treated with a solution of the above prepared acid chloride in anhydrous tetrahydrofuran (10 mL), and the mixture was stirred at room temperature for 15 hours, at 55° C. for one hour, and cooled (0° C.). Sodium methoxide/methanol (25%, 2.6 g, 12 mmol) was added, and the solution was stirred for one hour and passed through a column of alumina (eluted with 1:1 methanol/tetrahydrofuran). The filtrate was concentrated in vacuo and taken up in 2-propanol and filtered. Ether was added dropwise to the filtrate until no more precipitation was observed, and the suspension was cooled (0° C.), filtered, and the solid was collected and dried in vacuo to afford (after a second crop) 0.97 g (57%) of the title compound as a colorless solid; mp 139.0°-141.5° C.

Provenance & Evidence